California is preparing to extend the nation’s toughest carbon emissions rule another 10 years through 2030. The state Senate passed the bill 25-13 on Wednesday, a day after a 42-29 vote passed it through the state Assembly. Gov. Jerry Brown has said he intends to sign the bill into law, which aims to reduce greenhouse-gas emissions to 40 percent less than 1990 levels by 2030. It’s been combined with a separate bill, a process called “double-joined” in Sacramento, that will tighten the state legislature’s oversight of the California Air Resources Board. That bill passed through on Tuesday. The new climate change law builds on a 2006 state law enacted by then-Governor Arnold Schwarzenegger. That law put in motion the nation’s most comprehensive and strict measures to limit carbon emissions from vehicles and produced by industries such as manufacturing, electric utilities, a...